What makes some radial tires cause a vehicle to pull to the right or left when driving?
The term for this problem is conicity. Perhaps an oversimplification, but the tire is slightly cone shaped, rather than flat across its tread surface. As with any cone shaped object, the tire tends to roll in a circle, toward the shorter side. Conicity is normally cause by uneven distribution of belting under the tread. Alignment of the belts in the carcass is critical. If they are shifted, even a tiny amount, the tire tread will not inflate perfectly flat. If one side of the tread inflates slightly higher than the other, effectively a cone is formed, thus the pull.
